Edit to add first: obvious reasons I like Polar. But I just want to say I believe in Polar and use Polar and would use Polar and support them even if I was not connected to them. Just dumb luck I am. Using Polar watches I went from a 3:10 minute Olympic triathlon to a 2:27 minute oly. And from a 1:45 minute sprint to under a hour!!! Half IM.. I'm well.... I am still working on it if only not for the knarlie bike accident this June ;0) But one of the main factors my times have come down has been the polar watch that is always on my wrist. Even when I am making a interior attack in a fully involved house fire!!. Any way here are some other reasons
Rcx5 has a lot of memory
Battery life is long and user friendly.
Customer service will be the best hands down if you ever need to use them or if you just have a question.
Easy to use polar website for downloading your workouts and analyzing them.
Polar was one of the first HR monitors in the business and the most reliable.
If you go to a gym on a rainy day most likely your polar HR belt will work with the dreadmill or bike you are on.
Keeps track of your daily and weekly workouts
Visuabke and audible alarms when you exceed or fall below yout desied HR . (big in endurance longevity.)
Does a fitness test and tracks your progress.
Most comfortable HR belt in the industry.
And a big one for me is I can wear it out on the town and get compliments all night long on my watch. Just last night I got pulled over for not using my blinker( I did use it though I swear:0) and the officer complimented me on my watch and gave me a verbal "warning" and no ticket. Any other questions you have you can pm me
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Official Polar Ambassador
http://www.google.com/...P7RiWyEVwpunlsc2JtQQ